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Cationic Blue X-Bl Basic Blue 159 Dyes for Textile Chemicals. Brilliant Greenish-Blue with High Fastness: Cationic Blue X-BL (C.I. Basic Blue 159) delivers bright blue shades with excellent light fastness (Grade 6-7) and good leveling properties. Versatile Applications: Ideal for acrylic, modified polyester, nylon, cotton, and silk. Also suitable for paper, leather, paint, ink, and wood coloring. Reliable Quality: Available as blue powder, 250% strength. Excellent water solubility. Standard packaging: 25kg drums. C.I. Basic Blue 159 | CAS 105953-73-9 | EINECS 414-160-0. Simplify Your Sourcing: One dye handles acrylic, modified polyester, nylon, and cotton instead of managing multiple blue dyes. Reduced inventory and simplified production.